Nintendo really set of a wave of nostalgia-fueled gaming with the release of their NES Classic, which then paved the wave for the SNES Classic. According to NPD's Mat Piscatella, one out of every five consoles sold in the U.S. this year was a retro gaming device. Furthermore, Nintendo saw the lion's share of those sales.
In an interview with the NY Times, Reggie Fils-Aime explains why he thinks these classic platforms are such a hit with fans.
“People remember the colors and shape of the console and the feel of the controllers from their childhood, and they have a visceral reaction when they first fire up their favorite NES or Super NES games.”